Update crates/stdarch-gen/neon.spec

Co-Authored-By: bjorn3 <bjorn3@users.noreply.github.com>

Author: Licenser

crates/stdarch-gen/neon.spec

@@ -11,7 +11,7 @@
 // comment /////// is too.
 //
 // # Sections
-// Sections start with EXACTLY three slasshes followed
+// Sections start with EXACTLY three slashes followed
 // by AT LEAST one space. Sections are used for two things:
 //
 // 1) they serve as the doc comment for the given intrinics.